Natroba

NATROBA- spinosad suspension
ParaPRO LLC

1 INDICATIONS AND USAGE

1.1 Head Lice Infestations

NATROBATM is indicated for the topical treatment of head lice infestations in adult and pediatric patients 6 months of age and older.

Adjunctive Measures for Head Lice Infestations

NATROBA should be used in the context of an overall lice management program:

  • Wash in hot water or dry-clean all recently worn clothing, hats, used bedding and towels.
  • Wash personal care items such as combs, brushes and hair clips in hot water.
  • A fine-tooth comb or special nit comb may be used to remove dead lice and nits.

1.2 Scabies Infestations

NATROBA is indicated for the topical treatment of scabies infestations in adult and pediatric patients 4 years of age and older.

Adjunctive Measures for Scabies Infestations

  • Wash in hot water or dry-clean any bedding, clothing and towels used by anyone having scabies.

2 DOSAGE AND ADMINISTRATION

2.1 Important Administration Instructions

  • For topical use only. NATROBA is not for oral, ophthalmic, or intravaginal use.
  • Avoid contact with eyes. If NATROBA gets in or near the eyes, rinse thoroughly with water.

2.2 Treatment of Head Lice Infestations

  • Shake bottle well.
  • Apply a sufficient amount of NATROBA to cover dry scalp, then apply to dry hair. Depending on hair length, apply up to 120 mL (one bottle) to adequately cover scalp and hair.
  • Leave on for 10 minutes, then thoroughly rinse off with warm water.
  • Wash hands after use.
  • If live lice are seen 7 days after the first treatment, a second treatment should be applied.
  • Apply NATROBA on pediatric patient only under direct supervision of an adult [see Warnings and Precautions (5.1)].

2.3 Treatment of Scabies Infestations

  • Shake bottle well.
  • Apply a sufficient amount of NATROBA to skin to completely cover the body from the neck to the toes (including the soles of the feet).
  • For patients with balding scalp, also apply product to the scalp, hairline, temples, and forehead.
  • Allow to absorb into the skin and dry for 10 minutes before getting dressed.
  • Leave on the skin for at least 6 hours before showering or bathing.
  • Apply NATROBA on pediatric patient only under direct supervision of an adult.

3 DOSAGE FORMS AND STRENGTHS

Topical suspension: 0.9% w/w; each gram contains 9 mg of spinosad in a viscous, slightly opaque (white soft particles may be visible), light orange-colored suspension in 120 mL bottles.

4 CONTRAINDICATIONS

None.

5 WARNINGS AND PRECAUTIONS

5.1 Benzyl Alcohol Toxicity

NATROBA contains benzyl alcohol and is not approved for use in neonates and infants below the age of 6 months. Systemic exposure to benzyl alcohol has been associated with serious adverse reactions and death in neonates and low birth-weight infants when administered intravenously [See Use in Specific Populations (8.4)].

6 ADVERSE REACTIONS

6.1 Clinical Studies Experience

Because clinical studies are conducted under widely varying conditions, adverse reaction rates observed in the clinical studies of a drug cannot be directly compared to rates in the clinical studies of another drug and may not reflect the rates observed in clinical practice.

Head Lice Infestations

NATROBA was studied in two randomized, active-controlled trials (N=552) in subjects with head lice; Table 1 presents selected adverse events, regardless of relationship to NATROBA, that occurred in at least 1% of subjects.

Table 1: Selected Adverse Events Occurring in at least 1% of Subjects with Head Lice Infestation
Signs Natroba (N=552) Permethrin 1% (N=457)
Application site erythema 17 (3%) 31(7%)
Ocular erythema 12 (2%) 15 (3%)
Application site irritation 5 (1%) 7 (2%)

Other less common reactions (less than 1% but more than 0.1%) were application site dryness, application site exfoliation, alopecia, and dry skin.

Scabies Infestations

NATROBA was studied in three randomized, double-blind, vehicle-controlled trials (Trial 1, Trial 2, and Trial 3) in 592 subjects with scabies infestation, of which 165 were ages 4-17 and 427 were adults. Subjects received a single application of NATROBA to the skin from the neck to the soles of the feet, which was washed off after a minimum of 6 hours. Table 2 presents adverse reactions related to NATROBA treatment that occurred in at least 1% of subjects.

Table 2: Adverse Reactions Occurring in at least 1% of Subjects with Scabies Infestation (Trials 1, 2 and 3)
Signs Natroba (N=322) Vehicle (N=270)
Application site irritation* 8 (3%) 0 (0%)
Dry skin 6 (2%) 0 (0%)

*Application site irritation also includes application site pain and burning sensation.

8 USE IN SPECIFIC POPULATIONS

8.1 Pregnancy

Risk Summary

Spinosad, the active ingredient in NATROBA, is not absorbed systemically following topical application, and maternal use is not expected to result in fetal exposure to the drug. NATROBA contains benzyl alcohol. Topical benzyl alcohol is unlikely to be absorbed through the skin in clinically relevant amounts; therefore, maternal use is not expected to result in fetal exposure to the drug [see Clinical Pharmacology (12.3)].

In animal reproduction studies, no adverse embryofetal effects were seen at oral doses of spinosad up to 200 mg/kg/day in pregnant rats or 50 mg/kg/day in pregnant rabbits administered during the period of organogenesis (see Data). The available data do not allow the calculation of relevant comparisons between the systemic exposure of spinosad in animal studies to the systemic exposure that would be expected in humans after topical use of NATROBA.

The background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk for birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2 to 4% and 15 to 20%, respectively.

Data

Animal Data

Systemic embryofetal development studies were conducted in rats and rabbits. Oral doses of 10, 50 and 200 mg/kg/day spinosad were administered during the period of organogenesis (gestational days 6 – 15) to pregnant female rats. No adverse embryofetal effects were noted at any dose. Maternal toxicity occurred at 200 mg/kg/day. Oral doses of 2.5, 10, and 50 mg/kg/day spinosad were administered during the period of organogenesis (gestational days 7 – 19) to pregnant female rabbits. No adverse embryofetal effects were noted at any dose. Maternal toxicity occurred at 50 mg/kg/day.

A two-generation dietary reproduction study was conducted in rats. Oral doses of 3, 10, and 100 mg/kg/day spinosad were administered to male and female rats from 10-12 weeks prior to mating and throughout mating, parturition, and lactation. No reproductive/developmental toxicity was noted at doses up to 10 mg/kg/day. In the presence of maternal toxicity, increased dystocia in parturition, decreased gestation survival, decreased litter size, decreased pup body weight, and decreased neonatal survival occurred at a dose of 100 mg/kg/day.

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